Preparation of 8-Substituted Xanthine CVT-124 Precursor by Late Stage Pyrimidine Ring Closure
作者:R. Jason Herr、Paul F. Vogt、Harold Meckler、Michael P. Trova、Steven R. Schow、Russell C. Petter
DOI:10.1021/jo015925r
日期:2002.1.1
scaleable synthesis of the chiral xanthine CVT-124 (1, aka. BG9719), a method for the late stage pyrimidine ring closure of the nitrogen-protected endo 2-norbornenyl imidazole 3 was developed. The three-component coupling of benzylamine, 2-cyanoglycine ethyl ester (4), and methyl 5-norbornene-2-carboximidate hydrochloride (5) was demonstrated to achieve 3 in 23-46% isolated yields. The imidazole 3 was
为了开发可规模合成手性黄嘌呤CVT-124(1,又名BG9719)的新途径,开发了一种用于氮保护的内2-降冰片烯基咪唑3的后期嘧啶环封闭的方法。证明了苄胺,2-氰基甘氨酸乙酯(4)和5-降冰片烯-2-羧甲基亚氨酸甲酯盐酸盐(5)的三组分偶联可实现23-46%的分离产率中的3。然后,将咪唑3精细化以构建N-苄基黄嘌呤2,其为exo和内聚异构体的1:1混合物,在此阶段可通过色谱法分离。氮保护的内黄嘌呤2是CVT-124合成中的关键中间体。